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Optical coatings for absorption cells
Oulehla, Jindřich ; Hrabina, Jan ; Holá, Miroslava ; Pokorný, Pavel ; Lazar, Josef
One of the key optical components used in laser stabilisation is an absorption cell filled with a gas medium. The optical windows of these cells are antireflection coated to minimise optical losses. During the production process, these coatings are subject to high temperatures and are in direct contact with the gas medium. In some special applications, there might be other factors, such as cosmic radiation, to consider. This contribution deals with the coatings’ resistance to these effects.
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Free-space optical link fro coherent transfer
Hrabina, Jan ; Čížek, Martin ; Barcík, P. ; Kolka, Z. ; Skryja, P. ; Wilfert, O.
The dissemination of precise optical frequencies and time has an irreplaceable role in many applications (scientific experiments in time and frequency metrology, security of critical infrastructures, synchronisation of navigation systems, sensors). We must deploy a different transmission type where optical fibre links cannot be used. The paper describes the possible distribution of stable optical frequencies by the free-space optical link between FEEC BUT Brno (responsible for development and operation of FSO units) and ISI CAS CR (responsible for optical laser source, optical fibre links, data processing).
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Laser spectroscopy and absorption spectra of HCN
Hošek, Martin ; Hrabina, Jan ; Řeřucha, Šimon ; Pravdová, Lenka ; Lazar, Josef ; Číp, Ondřej
Hydrogen Cyanide (specifically isotope H13C14N) has significant potential as an absorption medium for the frequency stabilised lasers’ realisation because its absorption spectrum covers the whole telecommunication C-band (1530-1565 nm). The broad absorption spectrum can be used not only for calibration of optical telecommunication devices but also for modern interferometric methods that are useful for measuring macroscale objects (e.g., FSI - frequency scanning interferometry). Our research aims to precisely characterise the profile of HCN’s spectral lines and determine the optical frequency of absorption lines’ corresponding centres.
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Phase coherent link between ISI and BEV
Čížek, Martin ; Pravdová, Lenka ; Hrabina, Jan ; Lazar, Josef ; Číp, Ondřej ; Havliš, O. ; Altmannová, L. ; Smotlacha, V. ; Vojtěch, J. ; Pronebner, T. ; Aeikens, E. ; Premper, J. ; Mache, W. ; Niessner, A. ; Schumm, T.
The paper deals with the current state and the first experiments performed on a 232 km long cross-border phase-coherent line between ISI in Brno and BEV in Vienna. This line is the first operational segment of the planned network for mutual comparison of different types of optical atomic clocks between ISI (Ca +), BEV (Cs) and Atominstitut (Thorium) in Vienna. At all workplaces, local highly coherent lasers (spectral line width in the order of Hz or better) will be synchronized with the link output. This network of synchronized lasers will serve as a transfer medium for the mutual comparison of optical atomic clocks in individual laboratories.
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Automatisation of an experimental setup for optical spectroscopy
Hrabina, Jakub ; Gallina, Pavel (referee) ; Dvořák, Petr (advisor)
This bachelor thesis deals with the development and description of an application that enabled full automation of an experimental assembly for spectral mapping using confocal optical microscopy. It presents communication with all individual devices and explains the principle of data collection from the examined sample and their subsequent mathematical processing. The output of this application is the visualization of 2D spectral maps evaluating the intensity and position of spectral peaks, with the possibility of exporting user-friendly point spectra. In addition, the work further describes a research study of optical confocal spectroscopy with applications to nanophotonics. In addition, the functionality of the whole application is demonstrated on the spectral response of a 2D metasurface, which acts as a Bayer mask.
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